Product manual

22 Cheetah 15K.3 FC Product Manual, Rev. D
6.2.1 Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power
connector.
6.2.2 Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
6.2.3 Current profiles
The +12V and +5V current profiles for the ST373453FC, ST336753FC, and ST318453FC models are shown
below in the following figures.
T0 Power is applied to the drive.
T1 Controller self-tests are performed.
T2 Spindle begins to accelerate under current limiting after performing internal diagnostics.
T3 Spindle is up to speed and the Head-Arm restraint is unlocked.
Note: All times and currents are typical. See Table 2 for maximum current requirements.
Figure 2. Typical ST373453FC drive +12V current profile
+5V +12V
0 to 100 kHz 150mV 150mV
100 kHz to 10 MHz 100mV 100mV